<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
    <title>第七课 运算符</title>
</head> 
<body>
    <script>
        // var num1 = 25;
        // var num2 = ~num1;
        // alert(num2);
        // var a = 1,b = 2,c = 3;
        // var arr = [1,2,3];
        // var obj = {x:1,y:2};

        // 5 < 3 ? alert(1) : alert(2)

        // if(true){
        //     alert(1)
        // }else{
        //     alert(2)
        // }

        true && (1 < 2 || 100 > 1) || false && !'helloxingxingketang'

    </script>                     
</body> 
</html>